Chapel Island Formation

The Chapel Island Formation is a sedimentary formation from the Burin Peninsula, Newfoundland, Canada. It is a succession of siliciclastic deposits, over 1000 m thick, that were deposited during the latest Ediacaran and earliest Cambrian.

Stratigraphy
The formation's sequence stratigraphy is detailed in a journal article by Myrow and Hiscott. The formation starts in an intertidal zone, then, as the Cambrian progresses, becomes deeper water (outer shelf) as a general trend.

The Chapel Island Formation lies on top of the Rencontre Formation and below the Random Formation. It is 900 m thick in Fortune Bay as a fault-bounded basin, consisting of grey-green siltstones and sandstones, with minor limestone beds near its top. Small shelly fossils have been recovered – primitive taxa only. The setting is nearshore or open shelf.

Subdivisions
The formation is divided into six members, numbered 1 to 5, with Member 2 split into 2A and 2B. The Proterozoic–Cambrian boundary occurs 20.66 m above the base of the formation, 2.4 m into Member 2A.

The lowest occurrence of Treptichnus pedum in the succession is 16.25 m above the base of the unit.